WO2012014558A1

WO2012014558A1 - Waste-paper recycling device

Info

Publication number: WO2012014558A1
Application number: PCT/JP2011/061797
Authority: WO
Inventors: 山本　和也; 晋基谷本; 章川口
Original assignee: デュプロ精工株式会社
Priority date: 2010-07-27
Filing date: 2011-05-24
Publication date: 2012-02-02
Also published as: JP5606202B2; DE112011102496T5; JP2012026060A

Abstract

The disclosed waste-paper recycling device is provided with: a papermaking unit (2) that performs a papermaking step in which a wet web (100) is formed into paper; a water-removal unit (3) that performs a water-removal step in which water is removed from the wet web (100); and a drying unit (4) that performs a drying step in which the wet web (100) is dried. The water-removal unit (3) has a water-absorbing belt (32), comprising a water-absorbing material, on which the wet web (100) is transferred from the papermaking unit (2). The drying unit (4) has: a smooth-surfaced belt (43), comprising a non-water-absorbing material, on which the wet web (100) is transferred from the water-absorbing belt in the water-removal unit (3); and a drying roller (41) that heats the smooth-surfaced belt (43) and the wet web (100).

Description

Waste paper recycling processor

The present invention relates to a used paper recycling apparatus, and relates to wet paper dewatering technology.

Conventionally, this type of technology is disclosed in, for example, Japanese Patent Publication No. 2004-204375. This consists of a head box for supplying pulp liquid, a wire part, a press part and a dryer part.

The headbox is a part that distributes papermaking materials equally on the wire and mesh. The wire part is composed of a plurality of rollers and a wire belt that spans the forming roller. The wire belt receives the diluted material that is 99.8% or more of water supplied from the head box and discharges the water. It has become a net to do.

The press part consists of a suction press roller and a felt belt that is stretched across multiple rollers. The felt belt rotates to overlap the wire part at the forming roller of the wire part, and performs wet paper while dehydrating and forming paper. Take from the wire parts. The suction press roller compresses the wet paper under high pressure between the dryer drum surface of the dryer parts to dehydrate the moisture of the wet paper, and vacuums the dehydrated water.

Moreover, in the papermaking apparatus described in Japanese Patent Publication No. 2009-1925, a slurry-like pulp suspension sent from the pulp manufacturing section in the previous process is made into wet paper by the papermaking process section. The wet paper formed in the paper making process section is dried in the drying process section to obtain recycled paper.

The mesh belt extending over the entire length of the papermaking process section and the drying process section has a mesh structure consisting of numerous meshes for filtering and dewatering the pulp suspension, and the smooth surface belt is linear with the mesh belt over the entire length of the drying process. Travel parallel and close. The drying process unit is a part that heats and dries the wet paper sandwiched and conveyed between the mesh belt and the smooth surface belt, and heats the smooth surface belt that supports the lower surface of the wet paper with a heater.

However, in the above-mentioned JP-A-2004-204375, the felt belt and the wet paper are pressed between the press part suction and press roller and the dryer part dryer to dehydrate, and the moisture contained in the wet paper is suctioned. Vacuum is sucked through the felt belt through the press roller. In this configuration, the moisture contained in the wet paper and the moisture contained in the felt belt before dehydration come into contact with the dryer, so that the drying load (heat load) of the dryer increases.

In Japanese Patent Application Laid-Open No. 2009-1925, since the mesh belt cannot exhibit water absorbing ability, the wet paper sandwiched and conveyed between the mesh belt and the smooth surface belt is dehydrated between the press roller and the dewatering roller, and then the drying step The wet paper is heated and dried in the part.

However, squeezing and dewatering the wet paper with a high water content causes the fibers in the wet paper to be unevenly distributed. The mesh belt does not absorb water in the metal belt material itself, but a part of the water released from the wet paper adheres to the mesh or on the belt material surface and is transported above the heater to create a smooth surface. A drying load of the heating heater is applied via the belt and the wet paper, and a drying load more than an amount of heat necessary for drying only the wet paper acts on the heating heater.

Furthermore, the transfer performance is another requirement that affects the quality of recycled paper. For example, in Patent Document 1, when a wet paper made from paper is transferred from a wire belt to a felt belt, or when the wet paper is transferred from a felt belt to a drum surface of a dryer, all the paper sheets are transferred without any defects. It is necessary to move as it is. Factors that contribute to transfer performance include peelability between the wire belt or felt belt and the wet paper, and adhesion between the surface to be transferred such as the felt belt or drum surface and the wet paper. Is also an element for efficiently drying wet paper.

The present invention reduces the drying load in the drying section, avoids press dehydration in a state with a high water content, stabilizes the transfer performance, and improves the thermal efficiency and dewatering performance of the drying section. An object is to provide a reproduction processing apparatus.

In order to solve the above-described problems, the used paper recycling apparatus of the present invention includes a papermaking section that forms a wet paper, a dewatering section that performs a dewatering process that dehydrates the wet paper, and a drying process that dries the wet paper. The dehydrating unit has a water absorbing belt made of a water absorbing material from which the wet paper is transferred from the paper making unit, and the drying unit is made from a non-water absorbing material from which the wet paper is transferred from the water absorbing belt of the dewatering unit. And a heating unit that heats the smooth surface belt and the wet paper.

In the used paper recycling apparatus of the present invention, at least one pair of sandwiching a smooth belt positioned on the upper side and a water absorbing belt positioned on the lower side and pressing the wet paper between both belts via the smooth surface belt and the lower water absorbing belt. The dehydrating roller is provided.

In the used paper recycling apparatus of the present invention, the water absorbing belt is made of felt, the smooth surface belt is made of metal or synthetic resin, and the heating unit is made of a drying roller.

In the used paper recycling apparatus of the present invention, the smooth surface belt is characterized in that the transport surface that contacts the wet paper forms a smooth surface, and the transport surface is coated with a silicone resin coating or a fluororesin coating.

In the used paper recycling apparatus of the present invention, the drying unit is disposed to face the conveyance surface of the smooth surface belt, and has a breathable conveyance belt that sandwiches the wet paper with the smooth surface belt. .

In the used paper recycling apparatus of the present invention, the smooth surface belt and the transport belt extend to a position where the dried paper is delivered to a finishing section that forms the next process of the drying section.

As described above, according to the present invention, the wet paper is dehydrated by water absorption by the water absorption belt and then transferred to the smooth surface belt and dried in the drying section. Therefore, the moisture contained in the wet paper before dehydration and the water contained in the water absorption belt are Since there is no contact with the drying section, the dewatering performance can be improved, the drying load (heat load) of the drying section can be reduced, and the thermal efficiency can be improved.

After the wet paper is dehydrated by water absorption by the water absorption belt, the dehydration roller squeezes and dehydrates the wet paper between both belts via the smooth surface belt and the lower water absorption belt, avoiding the pressure dehydration in a state of high water content. The cause of uneven distribution of fibers in the wet paper can be suppressed.

Since the wet paper is held on the smooth surface belt, transferred to the heating unit and dried in that state, no extra man-hours such as transferring the wet paper to the surface of the heating unit are required, and the conveyance efficiency is good.

Schematic diagram showing a used paper recycling apparatus in an embodiment of the present invention Enlarged view showing the main part of FIG. The schematic diagram which shows the used paper processing apparatus in other embodiment of this invention The enlarged view which shows the principal part of FIG. The schematic diagram which shows the principal part of the used paper processing apparatus in other embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2, the used paper processing apparatus 1 includes a paper making unit 2 that performs a paper making process for making wet paper 100, a dehydrating unit 3 that performs a dehydrating process for dehydrating the wet paper, and a drying process for drying the wet paper. A drying unit 4 is provided, and a finishing unit 5 that performs a finishing process for finishing the dried paper is provided.

The paper making unit 2 has a wire belt 22 stretched between the first group of rollers 21 and a head box 23 for supplying the pulp suspension to the wire belt 22. Paper 100 is made. The wire belt 22 is made of metal or synthetic resin, has a mesh shape, and has water permeability and air permeability.

The dehydrating unit 3 is composed of a water absorbing belt 32 made of a water absorbing material stretched between the second group of rollers 31, and here the water absorbing belt 32 is made of felt and has air permeability. The felt is, for example, 14DTX, and has a basis weight of 1200 g / m ² , a thickness of 303 mm, a density of 0.364 g / cm ³ , a base fabric structure of a double structure, a synthetic resin, and a hydrophilic resin such as nylon.

The water absorption belt 32 and the wire belt 22 are in contact with each other in the middle of both conveying tracks to form a papermaking transfer portion 201. The angle formed by the wire belt 22 and the water absorbing belt 32 in the paper transfer section 201, that is, the incident angle θ1 of the wire belt 22 with respect to the water absorbing belt 32 is 10 to 20 °, and the first group of rollers that support the wire belt 22 The diameter of 21 is from φ60 mm to φ80 mm.

The wet paper 100 made on the conveying surface of the wire belt 22 by the paper making unit 2 is pressed by the water absorbing belt 32 in the paper making transfer unit 201, and the wire belt 22 is reversed along the outer periphery of the first group of rollers 21 to become wet. By separating from the paper 100, the wire belt 22 transfers to the water absorbing belt 32, and the water absorbing belt 32 absorbs water from the transferred wet paper 100 to dehydrate the wet paper 100.

The drying unit 4 includes a drying roller 41 that includes a heating device such as a heater and forms a heating unit, and a smooth surface belt 43 made of a non-water-absorbing material that spans between the drying roller 41 and the third group of rollers 42. And a conveyor belt 45 made of a non-water-absorbing material that is stretched between the fourth group of rollers 44. The water absorbing belt 32 and the smooth surface belt 43 of the dewatering unit 3 are in contact with each other in the middle of both conveying tracks, and the wet paper 100 is transferred from the water absorbing belt 32 of the dewatering unit 3 to the smooth surface belt 43 of the drying unit 4. A portion 202 is formed.

In the dewatering transfer section 202, a pair of

dewatering rollers

51 and 52 that sandwich the smooth surface belt 43 and the water absorbing belt 32 are disposed. In the present embodiment, the pair of

dewatering rollers

51 and 52 are provided, but a plurality of sets of

dewatering rollers

51 and 52 may be arranged. The pair of

dewatering rollers

51 and 52 is one of the rollers 31 of the dewatering unit 3 that contacts the water absorbing belt 32 positioned on the lower side and one of the rollers 42 of the drying unit 4 that contacts the smooth surface belt 43 positioned on the upper side. Consists of. The

dewatering rollers

51 and 52 squeeze and dehydrate the wet paper 100 between the two belts via the smooth surface belt 43 and the water absorption belt 32 and press the wet paper 100 against the smooth surface belt 43 so that the water absorption belt 32 is lowered. The wet paper web 100 is smoothly transferred from the water absorbing belt 32 to the smooth surface belt 43 by reversing along the outer periphery of the dehydrating roller 52 on the side and separating from the wet paper web 100.

The smooth surface belt 43 is made of metal or synthetic resin, and here is a non-breathable belt made of a thin stainless steel plate (SUS430) having a thickness of 0.2 mm. As for the smooth surface belt 43, the conveyance surface which contacts the wet paper web 100 is a smooth surface, and the conveyance surface is coated with a silicone resin coating or a fluororesin coating.

In this embodiment, the aperture ratio of the water absorbing belt 32 is smaller than the aperture ratio of the wire belt 22, and the smooth surface belt 43 has a thin plate shape and is non-breathable.

The conveyor belt 45 has a mesh-like air permeability and is made of a synthetic resin. The conveyor belt 45 is disposed to face the conveyor surface of the smooth surface belt 43 and sandwiches the wet paper 100 between the smooth surface belt 43. The smooth surface belt 43 and the conveyor belt 45 extend to a position where the dried paper 101 is delivered to the finishing unit 5 in the next process.

In addition, by cleaning and fountaining each of the wire belt 22, the water absorbing belt 32, and the smooth surface belt 43, or by providing a scraper, a brush roller, or the like, dust such as paper dust attached to each belt surface can be removed. It is also possible to remove it.

The finishing unit 5 includes a cutter 102 that cuts the dry paper 101 dried by the drying unit 4, and finishes the recycled paper 103 having a set size with the cutter 102.

The operation of the above configuration will be described. In the paper making unit 2, the pulp suspension is supplied from the head box 23 to the wire belt 22 to make the wet paper 100 on the conveying surface of the wire belt 22. In the dewatering unit 3, the wet paper 100 that has been made on the conveying surface of the wire belt 22 in the paper making unit is transferred to the water absorbing belt 32, and water is absorbed from the wet paper 100 by the water absorbing belt 32 to dehydrate the wet paper 100. The wet paper 100 of the wire belt 22 has a water content of about 99% immediately before the papermaking transfer section 201. In the papermaking transfer section 201, the incident angle θ1 between the wire belt 22 and the water absorbing belt 32 is 10 to 20 °, and the diameter of the first group of rollers 21 is φ60 to φ80. And the separation from the wet paper web 100 from the wire belt 22 can be performed smoothly.

Moreover, since the opening rate of the wire belt 22 is larger than the opening rate of the water absorbing belt 32 and the air permeability is superior to the air permeability of the water absorbing belt 32, the peelability is larger than the peelability of the water absorbing belt 32. The adhesion of the belt 32 is superior to the adhesion of the wire belt 22. Therefore, the wet paper web 100 is easily peeled off from the wire belt 22 having high peelability, easily attached to the water absorbent belt 32 having high adhesiveness, and the wet paper web 100 is easily transferred from the wire belt 22 to the water absorbent belt 32, and is high. Provides transfer performance.

In the drying unit 4, the wet paper 100 dehydrated by the water absorption belt 32 is transferred to the smooth surface belt 43 by the dehydration transfer unit 202. At this time, the pair of

dewatering rollers

51 and 52 of the dewatering transfer section 202 squeezes and dehydrates the wet paper 100 between both belts via the smooth surface belt 43 and the water absorbing belt 32, and smoothes the wet paper 100. By pressing the face belt 43, the transfer of the wet paper 100 is promoted and the transfer performance is enhanced. The wet paper 100 of the water absorbing belt 32 has a water content of about 80% immediately before the dewatering transfer section 202, and the wet paper 100 of the smooth surface belt 43 after the dewatering has a water content of about 50%.

Further, the smooth surface belt 43 is non-breathable and has higher adhesion than the breathable water absorbing belt 32. In other words, the peelability of the water absorbing belt 32 is superior to the peelability of the smooth surface belt 43. Therefore, the wet paper 100 is easily peeled off from the water-absorbing belt 32 having high peelability, and is easily stuck to the smooth surface belt 43 having high adhesiveness, and the wet paper 100 is easily transferred from the water-absorbing belt 32 to the smooth surface belt 43. . *

As described above, in the present embodiment, the wet paper 100 is transferred from the wire belt 22 having high air permeability and excellent peelability to the water absorption belt 32 having low air permeability and excellent adhesion, and further the water absorption belt. By transferring from 32 to a smooth surface belt 43 having no air permeability and excellent adhesion, transfer of the wet paper 100 is always performed from a belt having excellent peelability to a belt having excellent adhesion, and thus excellent transfer. Performance can be realized.

Then, the water squeezed by the

dewatering rollers

51 and 52 in a state where the smooth surface belt 43 is located above the water absorbing belt 32 is discharged to a tray (not shown) disposed below the dewatering roller 52. Therefore, the water absorbing belt 32 that has passed through the

dewatering rollers

51 and 52 is regenerated and can absorb water.

The smooth surface belt 43 to which the wet paper 100 has been transferred advances toward the drying roller 41, and the conveyance belt 45 runs parallel to the conveyance surface of the smooth surface belt 43 from the middle thereof, and the conveyance belt 45 and the smooth surface belt 43. The wet paper 100 is sandwiched between the two. In this state, the conveyance belt 45, the smooth surface belt 43, and the wet paper 100 advance as the drying roller 41 rolls, and the wet paper 100 is dried by the heat received from the drying roller 41 to become the dry paper 101. At this time, since the wet paper 100 is in close contact with the smooth surface belt 43 at the dehydration transfer portion 202, the thermal conductivity between the smooth surface belt 43 and the wet paper 100 is improved, and high thermal efficiency is realized.

Further, since the wet paper 100 is held on the smooth surface belt 43 and wound on the roller surface of the drying roller 41 and dried in that state, the extra man-hour such as transferring the wet paper 100 to the surface of the drying roller 41 is performed. Is not required, and the conveyance efficiency is improved.

The smooth surface belt 43 and the conveyor belt 45 extend to a position where the dry paper 101 is delivered to the finishing unit 5, and are reversed in directions opposite to each other to peel the dry paper 101. At this time, since the smooth surface belt 43 is coated with a silicone resin coating or a fluororesin coating on the transport surface, the dry paper 101 is smoothly peeled off.

As described above, the conveyance belt 45 sandwiches the wet paper web 100 between the outer surface of the drying roller 41 and the smooth surface belt 43, so that the outer surface of the drying roller 41 rotates the smooth surface belt 43 from below to above. However, the wet paper web 100 is prevented from being peeled off from the smooth surface belt 43 during reversal. Further, since the transport belt 45 transports the dried dry paper 101 while being sandwiched between the smooth surface belt 43 and the finishing section 5, the transport belt 45 curls the wet paper that has passed through the drying roller 41 due to the temperature difference between the front and back surfaces. Is prevented from occurring.

The finishing unit 5 finishes the recycled paper 103 peeled from the smooth surface belt 43 and the conveyor belt 45 into the recycled paper 103 having a set size by the cutter 102.

3 and 4 show another embodiment of the present invention, and the same reference numerals are given to components that perform the same operation as in the previous embodiment, and the description thereof will be omitted. 4 and 5, in order to guide the wire belt 22 that has passed through the papermaking transfer section 201 between the wire belt 22 of the papermaking section 2 and the water absorption belt 32 of the dewatering section 3 in the direction of the peeling angle θ2, It passes through the first group of rollers 21a and extends toward the next first group of rollers 21b on the transport path. The wet paper 100 can be smoothly performed from the wire belt 22 to the water absorbing belt 32 as the peeling angle θ2 is increased. Here, the peeling angle θ2 between the wire belt 22 and the water absorbing belt 32 between the

rollers

21a and 21b is preferably 30 ° or more.

FIG. 5 shows another embodiment of the present invention. Here, the

dewatering rollers

51 and 52 in the dewatering transfer unit 202 are such that the plane A including both axes is inclined at a minute angle θ3 with respect to the vertical surface B, and the upper dewatering roller 51 is the smooth surface belt 43 and the water absorbing belt. The lower dewatering roller 52 is positioned forward in the conveying direction of the smooth surface belt 43 and the water absorbing belt 32.

The upper dewatering roller 51 is directed from the reference position toward the rear in the rotation direction of the dewatering roller 51 with the nip portion 500 where both the

dewatering rollers

51 and 52 are in contact with each other via the smooth surface belt 43 and the water absorbing belt 32 as a reference position. The smooth surface belt 43 and the water absorbing belt 32 overlap the outer peripheral region corresponding to a predetermined angular range around the shaft center, and the lower dewatering roller 52 extends from the nip portion 500 at the reference position to the front in the rotation direction of the dewatering roller 52. The smooth surface belt 43 and the water absorbing belt 32 are overlapped with an outer peripheral region corresponding to a predetermined angle range around the axis toward the center.

The smooth surface belt 43 and the water absorption belt 32 form a conveyance track in which the angle θ4 is 4 to 5 ° when entering the dehydration transfer portion 202, and the angle θ5 between the smooth surface belt 43 and the water absorption belt 32 is 0 when separated from the dehydration transfer portion 202. It forms a transport track that forms 7-8 °.

With this configuration, before the smooth surface belt 43 and the water absorbing belt 32 reach the nip portion 500 where both the

dewatering rollers

51 and 52 come into contact with each other, the distance between the two belts gradually decreases, and the wet paper web 100 is interposed therebetween. As the smooth surface belt 43 and the water absorbing belt 32 overlap the outer peripheral surface of the upper dewatering roller 51 with the wet paper web 100 being sandwiched, the water absorbent belt 32 can sufficiently absorb the water of the wet paper web 100. Then, a preliminary transfer operation is performed.

After this preliminary transfer operation, the wet paper 100 is transferred from the water absorbing belt 32 to the smooth surface belt 43 by pressing the smooth surface belt 43 and the water absorbing belt 32 sandwiching the wet paper 100 at the nip portion 500 to transfer the wet paper 100 to the smooth surface belt 43. The texture of the paper 100 is good.

When the smooth surface belt 43, the water absorbing belt 32, and the wet paper 100 are suddenly pressed at the nip portion 500 without performing a preliminary transfer operation, the wet paper 100 moves in the direction opposite to the conveying direction of the smooth surface belt 43 and the water absorbing belt 32. The wet paper 100 is pushed and flows, and the transfer performance of the wet paper 100 from the water absorbing belt 32 to the smooth surface belt 43 is hindered, resulting in poor texture of the wet paper 100.

Claims

It has a paper making part that makes a wet paper, a dewatering part that makes a dewatering process that dehydrates the wet paper, and a drying part that makes the wet paper dry. The dewatering part transfers wet paper from the paper making part. A water-absorbing belt made of a water-absorbing material, a drying unit comprising a smooth surface belt made of a non-water-absorbing material in which wet paper is transferred from the water-absorbing belt of the dehydrating unit, and a heating unit for heating the smooth surface belt and the wet paper A used paper recycling apparatus characterized by comprising:
It has at least a pair of dewatering rollers that sandwich a smooth surface belt positioned on the upper side and a water absorbing belt positioned on the lower side and squeeze wet paper between both belts through the smooth surface belt and the lower water absorbing belt. The used paper recycling apparatus according to claim 1.
The used paper recycling apparatus according to claim 1, wherein the water absorbing belt is made of felt, the smooth surface belt is made of metal or synthetic resin, and the heating unit is made of a drying roller.
4. The smooth surface belt according to claim 1, wherein the conveyance surface that contacts the wet paper forms a smooth surface, and the conveyance surface is coated with a silicone resin coating or a fluororesin coating. 5. Used paper recycling equipment.
5. The drying unit according to claim 1, further comprising a breathable conveyance belt that is disposed to face the conveyance surface of the smooth surface belt and sandwiches the wet paper with the smooth surface belt. The used paper recycling apparatus according to item.
6. The used paper recycling apparatus according to claim 5, wherein the smooth surface belt and the conveying belt extend to a position where the dried paper is delivered to a finishing section which is a next process of the drying section.